Rotary pump.



A. T. BEAG & H. c. RUSS.l

' ROTARY PUMP. v APPLICATION FILED J'NE 3, 1909.

1,002,023. Patented Aug. 29, 1911.

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ROTARY PUMP.

APPLIUATIONI'ILBDJU'NE 3, 1909.

Patented Aug. 29, 1911.

3 SHEETS-SHEET 2.

A. T. BEACH & H. G'. RUSS.

ROTARY PUMP. APPLIOATION FILED JUNE 3, 1909.

1,002,023. 'Patented Aug.2 9, 1911.

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ARTHUR T. BEACH AND HOWARD C. RUSS, OF -NEW YORK, N. Y.

ROTARY Pinar.

To all whom it may concern:

Be it known that we, ARTHUR T. 'BEACH and HOWARD C. Russ, both citizens of the United States of America, the former residing in New York, borough of Brooklyn, `County of Kings, and State of New-York, and the latter in New York, borough of county and State of New York, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification. Y

This inventionV relates to rotary pumps especially rotary vacuum pumps for general use in the trade, the object of the invention being to render'pumps of this kind more efficient in operation.

More particularly the invention relates to helical mill cuts provided in the cylinder at the inlet and outlet ports, 4to provide for even wear of the pistons and to prevent the injurious pinching of air that would otherwise take place at this point.

In the accompanying drawings, Figure l represents a side-elevation of our rotary pump, Fig. 2 is a vertical longitudiline 2, 2, Fig. 3, Fig. 3 is a vertical transverse section on line 3, 3, Fig. l, Fig. 4 is a diagram illustrating the eXtra bore given to the interior of the cylinder for providing for the free motion of the gates, and Fig. 5 is a longitudinal vertical sectional view of the cylinder, the rotating drum being removed.

Similar letters of vreference indicate corresponding parts throughout the several fguresof the drawings.

ReferringV to the drawings, a represents a lcylinder whichis supported stationary on a suitable base-plate al and which is tightly in which arearranged for the piston-shaft s, provided with suitable shaft is supported ecclos'ed by heads a2 the .journal-bearings both bearings being stuling-boxes. 'The -centrically to the cylinder a and carries at the interior of the same a rotatable drum p, which rotates with, the shaft, and which is located eccentrically tothe cylinder, butforms tangential contact with the same at a point intermediately between the inletand outlet channels.

The drum p is provided with. two or four recesses b1 in which are guided radially sliding pistons b between' each pairof which are interposed square diametrical rods b2 which pass through round openings in thedrum'p and. shaft s. The

outer ends of the pistons b ,are provided Specification of Letters Patent. Application med June s, 1909. serial No.

improved Patented aug. 29, i911. 499,937.

with rounded grooves for receiving semicylindrical steel packing-bars d, which are accurately fitted intoI said grooves so as to turn in the same as the drum is rotated. The faces of the packing'bars d are slightly curved, corresponding to the interior curvature of the cylinder a, so as to form always intimate contact with the-same. The recesses in the drum y) are somewhat longer than Vthe length of the pistons and their packing bars, so as Vto prevent any concussion between the inner ends of the pistons and the inner during the rotation of the drum in the cylinder. The foregoing construction is clearly shown in Letters Patent No. 861,937, dated Julyl 30, 1907, for an improved rotary engine, and therefore not claimed in this application.

For providing tween the faces of the packing bars of each pair of pistons and for the tight fitting of ends f of the recessessaid packing bars to t-he interior surface of i the cylinder, the cylinder is first bored out to be a true cylinder and then the upper portion of the inner surface of the cylinder at each side of the` point of contact of the cylon anarc of a circle so as to provide accurately for the distance between the faces of the packing bars and produce'thereby Vthe proper ttiug of the pistons lto the interior surface of the cylinder and the proper suction and discharge of the air or other inedium through the inlet and outlet channels. Thebores at the upper part of the cylinder are'clearly shown in diagram, Fig. 4, and extend across the entire Width of the cylinder, the radius of each bore being equal to the radius of the cylinder.. If these auxiliary bores should not be provided, then the faces of the pistons would not tightly fit against the interior surface of the cylinder. The total length between the faces of the pistons `has to be equal to the diameter of the cylinder, as in shiftin owing to the eccentric position of the drum in the cylinder, the pistons would not otherwise be able to pass along' the upper part of the cylinder, or at least not without a'seriously impeding jamming action. .By the provision of the bores, the free motion of the pistons in the cylinder is secured, combined with the tight -tting of the pistons to the saine, and .a

very effective suction-action is thus obtained during the rotation of the piston. The pis- `inder 'and piston, is bored out sufliciently tons are preferably made f aluminum so as to reduce the weight of the same, while the packing bars are made of steel so as to resist more effectively the wear on the same.

The diametrical rods of each pair of vpistons are square in cross-section and pass sidewise of each other through the shaft and form with the round openings in the piston and shaft connecting channels between the recesses b1 of the gates, so that the air or other medium back of the pistons can freely pass from that piston which is compressing the air', to -the piston opposite thereto, so that the pistons are balanced, for the reason that the air or other medium which vpasses along the sides of the pistons exerts no backpressure on the air which is distributed in the space formed around the diametrical rod and in the space formed in the recess at the opposite side of the drinn. By this arrangement the free motion ofthe pistons is permitted, and likewise the free rotary n10- tion of the drum.

iVhen the faces of thc packing bars are gradually worn olf, the reduced thickness of the same, is compensated by inserting thin steel-plates n between the rear ends of the ranged in v the upper pistons and the adjacent ends of the diametrical rods between the pistons, the steelplates restoring the exact total length of the pistons and rods and keeping up the tight fitting of the pistons to the inner circumference of the cylinder. When the packing bars are worn down to such an extent that they do not project any more beyond the outer edges of the pistons they have to be replaced by new packing-bars, after which the interposed steel-plates are removed until they are gradually called into use again by the wearing oif of the packing-bars.

The inlet and outlet channels o 01 are ar- 'part of the cylinder equidistantly from the point of contact of cylinder and drum. Along the inner surface of the cylinder are arranged helical mill-cuts a for the purpose of preventing the uneven wear and consequently the untight fitting of the packing bars. The faces of the packing bars pass transversely over the I nill-` lbearing leading cuts and have therefore a uniform wear over their entire faces. preferably confined to the bores at the upper portion of the cylinder where extra tightness is required for the suction action of the pistons and for preventing the pinching or compressing of the air between the discharge and the contact-point of cylinder and drum. Vhen reversing the motion of the pump, the outlet channel becomes the inletand the inlet-channel becomes the outlet channel, the mill-cuts on the opposite bore acting then in the same manner on the pistons and the air being compressed at the point before stated.

For the purpose of lubricating the drumshaftaudits j ournal-bearings on outwardlyinclined channel is arranged in the brassfrom the oil-receptacle to the surface of the shaft at the outer end of journal. This channel is provided in each journal-bearing. Owing to the partial vacuum at the interior ofthe drum created byV the pistons, a slight suction is exerted on the lubricating oil in inward direction, so that the entire surface of the journals is effectively lubricated.

Having thus described ourinvention, we claim as new and desire to secure by Letters Patent: l

A rotary pump comprising a cylinder having separated inlet and discharge openings in the upper part thereof and narrow helical mill-cuts in its inner surface adjacent to said openings, a rotatable drum disposed eccent-rically within said cylinder and provided with diametrical recesses, and pistons movable within said recesses and contacting with the inner snrfaceof the cylinder. l

In testimony, that we claim the foregoing as our invention, we have signed our names in presence of two subscribing Witnesses.

ARTHUR T. BEACH. HOWARD C. RUSS.

Witnesses:

PAUL Gonrnn, HENRY J. SUHRBIER.

. The mill-cuts are 

